Radioshack didn't sell stuff for makers. They lost their identity. They started selling cell pones and headphones and gadgets. When times got tough they forgot who they were, that's what happened. They also had too many stores. Like, 10 per city in my area.
I dont even think they sold Arduino's in stores around here. I went there once to get a npn logic level mosfet and the dude looked at me crosseyed. The margins on electronic compoents are obscene when you get into small quantities.
Microcenter is a adafruit type store for makers, it seems to be doing OK.